A tanker discharged 33,000 litres of kerosene into the underground tanks of AP Petrol Station. After selling half of it, NNPC brought a pump to withdraw the balance. If the pump siphons at the rate of 250 litres per minute, how long will it take to empty the underground tank if only 2,500 litres is to be left?
A. 36 minutes B. 46 minutes C. 56 minutes D. 66 minutes
Correct Answer: C
Explanation
The total amount of kerosene to be withdrawn is 33,000/2 = 16,500 litres. The pump siphons at a rate of 250 litres per minute. So, it will take 16,500/250 = 66 minutes to empty the tank, leaving 2,500 litres.
